Is it possible to capture 8mp image using opencv?

Python
,
1

i tried capture 8mp image in opencv.

but saved image’s resolution is always (1944, 2592) ← 5mp

How to capture 8mp image?

i tried below

import cv2

cap = cv2.VideoCapture(0)

cap.set(cv2.CAP_PROP_FRAME_WIDTH, 3264)

cap.set(cv2.CAP_PROP_FRAME_HEIGHT, 2448)

ret, frame = cap.read()

print(frame.shape)

if ret:

cv2.imwrite('./frame.jpg', frame)
2

please check the return value (it’s probably not supported)

(also, if i may ask, what on earth do you want with 8mp in computer-vision ?)

3

frame.shape returned (1944, 2592)

I have to use high resolution camera images to find very small objects.

When I actually tried it, 5mp is ambiguous and it starts to look good from 8mp

4

does the camera sensor even have 8 MP?

the full resolution may not be supported in video modes but only in still modes.

cameras distinguish between those, although it’s a purely arbitrary distinction. still modes have no expectation of “decent frame rate”.

5

It was confirmed that the camera in the windows environment can shoot at 8mp and the image of 8mp resolution is saved…

Are you saying i should use a function to capture in still mode, not a videocapture function?

6

you’re probably using the MSMF backend (default) on windows, try if the directshow one works better for you:

cap = cv2.VideoCapture(0, cv2.CAP_DSHOW)
7

I’ve already tried it, but when I do that, the size of the image comes out correctly, but a black image is saved.

8

I don’t know why, but it was solved by using CAP_DSHOW and setting the focus and brightness.

Thank you!